FNMAE Section 404.06 - Gross Living Area
The most common comparison for single-family properties (including units in PUD, condominium, or cooperative projects) is above-grade gross living area. The appraiser must be consistent when he or she calculates and reports the finished above-grade room count and the square feet of gross living area that is above-grade. For units in condominium or cooperative projects, the appraiser should use interior perimeter unit dimensions to calculate the gross living area. In all other instances, the appraiser should use the exterior building dimensions per floor to calculate the above-grade gross living area of a property. Only finished above-grade areas should be used-- garages and basements (including those that are partially above-grade) should not be included. We consider a level to be below-grade if any portion of it is below-grade--regardless of the quality of its "finish" or the window area of any room. Therefore, a walk-out basement with finished rooms would not be included in the above-grade room count.
Rooms that are not included in the above-grade room count may add substantially to the value of a property--particularly when the quality of the "finish" is high. For that reason, the appraiser should report the basement or other partially below-grade areas separately and make appropriate adjustments for them on the "basement and finished areas below-grade" line in the "sales comparison analysis" grid. To assure consistency in the sales comparison analysis, the appraiser generally should compare above-grade areas to above-grade areas and below- grade areas to below-grade areas. The appraiser may deviate from this approach if the style of the subject property or of any of the comparables does not lend itself to such comparisons. However, in such instances, he or she must explain the reason for the deviation and clearly describe the comparisons that were made.
Section 404.07 - Gross Building Area
Gross building area, which is the total finished area (including any interior common areas, such as stairways and hallways) of the improvements based on exterior measurements, is the most common comparison for two- to four-family properties. The gross building area must be consistently developed for the subject property and all comparables that the appraiser uses. It should include all finished above- and below-grade living areas, counting all interior common areas (such as stairways, hallways, storage rooms, etc.) but not counting exterior common areas (such as open stairways).
We will accept the use of other comparisons for two- to four-family properties (such as the total above-grade and below-grade areas as discussed above in Section 404.06), as long as the appraiser explains the reasons he or she did not use a gross building area comparison and clearly describes the comparisons that were made.
If they were that adamant about it they would replace should with must.